I am 18 years old, nearly 19 and I can barely stretch my foreskin back enough to be able to see a sliver of my actual glans, I don't normally have trouble with It but I am worried that it could cause complications later in life such as with sex, is there anything I can do?

There are stretching exercises that you should commit to doing. It does take time though and is not a quick fix. You can do some searching here in the forums and/or elsewhere and come back for more help if you need.